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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c0a7c72dd94d15cc2722b5a3344a5c3fb92685307a7502b4a100e8d08a383a' 
  AND token = '45Nr3R6lB18NVGS+jdDc26f6rCGKt4vGmUO15ufyKF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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