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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38293fbf7f726fb38f7e6eb4329e83e92d30e8dd617ee655c07211c7aa417d9e' 
  AND token = 'w+2y78Zb31jGf6P54H0E5ms7yFcS72ksn0iXS7KGxEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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