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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ad9ab5ef0eb916d6908878814d00e7203f741a3b3b4e16291a315e954ac056' 
  AND token = 'yIJBw26cqNCOz5bVUJZVZ5NwWTPI9J8vCXDNgotuWtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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