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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292424dd9a0cf83ef6ad08ab8364c2648ae2565c358f4732fbe99470e800d94e' 
  AND token = 'Q0abhY12aeT45sO/wp02087IqYuoTbIgdYDOdxrUeeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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