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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60240bdd1bf505f0284a20a440519e0af067ad181d8459efcde9b22b20dde9a0' 
  AND token = 'mp5FtsO2H2gk7xaBaaGCzGGVYpizVDGVk+xbaT959eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}