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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aca1164aac06a2aca19dc3c62e76c6adcc7ef2b6b7395737b789b653025f8a1' 
  AND token = 'kzbWyJVzwvmF0it2AjmkXZA+VSCYk8cAWZACHrkH8Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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