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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206594d332f107ce8f311a78531e81125a9160d4b696eb6131c37fc2fbe3b1eb' 
  AND token = '71XAcZiyY832f/+L270IBr1xnMnA9+0tSZcHOD3dfS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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