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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7daf35ebc5bc29295e52e9b1e19d3aa1283ba1ef54acf7539f1a7b9946b60150' 
  AND token = 'IohuE+TmDCotRJ/IBwEw24fNGZoCojtiD3svjfuwB3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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