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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7894a26a2c289b58a9e9a0a58be3dade74e77ae851c7a2343fc9734d3ac8fe4' 
  AND token = '6OD8pv6dXM7YCXT73McTPcFCp5v3k2LJNw/AgZux/sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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