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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ecd8500e2cc70ee2382573cb075eb279194fab217ebedd93e1d9689e848748d' 
  AND token = 'wH50NHkq6DWPlchKxFXYBkv+FlVAiijqTa/bj4ZZkNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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