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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3accb7e930d799d3a9bba23feec0b1c36236bfd8948da137ae62d8c5554b45b' 
  AND token = 'KV7DPA/RZ2SO9v8hIbkycPSYU5k6Lx7PYzqq8CT59hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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