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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e2db342a2b0fdcf5a7ab741de36ca8e6749792844aeb671be176cd613bbcb84' 
  AND token = '7cWt2hdh/uG8fRrPWkud3LCXEQvU5B8S5mkhE0gGjpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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