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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '701c512d4da2eecd18ab3b3b0a435cf0753f1b11c1a56fe4949f9a3e2fc3be80' 
  AND token = 'W70CtwQry8/rC1/Lz+biQgy2GKLYlozzA8wrz9SIxuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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