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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ca3f17d64cac538e86196e5af86266a670a09c081dd9bbb50499219e7117d3' 
  AND token = '+nWc1swwY/Mxdp+lKeTxbOTx8svz1qTc7jkRfqDRwr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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