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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd30ed6b173a1236bd829564ba8cc230d27986d913f2b6edd5da614a884e987' 
  AND token = 'UyJ4nqDA2yhKdaAKoKNAuBFqHRutPgeOk3g7koyUyY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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