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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907c970eb7c42fe0b8b2ce356c1e7d89a633c332eadc7c6606e3b19b9c6c3501' 
  AND token = 'ahnrdqy0Z6PjZ1JTl6G/wssy5fm6PMYD3pGJDNP6R4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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