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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7b0cfc83134ad5398c09711c8eee0390073c527966d2e8fc195b1c0314a570' 
  AND token = 'aHrTnHNVNAt8jLpf0ogbl2BXG1U4NFa11N3jU2xoAQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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