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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0bbc0cbd1711028e197004a1fe84ae0c05835ba1f1da1c826d99b0cb3b0cb70' 
  AND token = 'K7JYaHELmCVWpvlPcPVr2CMQpqA9Q+J3NnKkONbZKmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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