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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318b393ab62a45d51dc02b82abe2384a56a3bc96e2f3c88702baf90ddd6e136c' 
  AND token = 'kbEIreGgrS06B5rlIJtGxbFIvIZuLcBM+DUSbD6o0d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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