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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8afc70bb24dd17ae21d8126cd143b4728bdce0483a9847ae3d26388dec3ad80d' 
  AND token = 'rp/Nvs38FrcJEpkNHWM7+CcyO2Ouqksppz5q2drg/zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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