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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fce98ffd0b742fe8e85164ef3d09f66a44336670d9e149e4f0e6125571aec88' 
  AND token = 'LXKy9kGCiTVtQZdEQVMrRXyCE6sA5A8lGBQthcO9v7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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