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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7beffa875c7849e275e3285324014a5c218a0bcf517e3803fb1a7053d98958' 
  AND token = 'TWEdsKc9Ntj8FWnQwa5k5Ygt/r1nEVomiUo1fkBIghk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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