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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3392d900e1025243c9316b1e2240a7578762bf737c3e77bfc7580130c7539cfa' 
  AND token = '08LgpedBc2voqcAnDvnZmJkT+cbbchj5XTUDgg8EBTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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