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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504b154b385e2fbbef5a9e03d77a05abee9c73a917f68e74d104c1d822d8fb5c' 
  AND token = '1MpJYirJ34s70LsTNn1xz+nksHlpVqMfdF0HqzlSD24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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