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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6ca3cb67d8e5d457b43dd43563c48bebdf4363b65f8fe48a0bb40c270b67ac' 
  AND token = 'f0Pcj90K3RGgReiur5MINSpn8dnlc9DV9T5gzfZcQeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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