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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d4a9852257e9face7886f649c81d93e319c77c2ede08ac26acb41b83c0bae6' 
  AND token = 'WSd024QBw+VfTvX/h3Ieiz/izB44Rg8KdhKad7vu1N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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