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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d3a138118a3a96dc3f423c06e0475fbd1b2e3ebd2609a2aa22f40207a741bb' 
  AND token = '2s6bvd+f99Wjho/8Fu/oR35ZgIGgXAC8FqOD5ipRnN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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