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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeab6d089d6071d76ee66e69328b9fb2304dc36f9f3303ab6d070da0751e8ec2' 
  AND token = '9SBfip0kJexprJIzJIxKONCVaFRkOefTChsPg7bxmJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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