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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f319688ea2b46f7ac7a4793c02a181fbdc2e02792c966b4c506f431fa0c79c' 
  AND token = 'Ru2tcT9iQzmlGOAPLpElud1i8OwzRePot8qz6VfqLMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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