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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2265a431d086830ded5d3d118c00fd43b5301cca31b29a00b6b7d8776f53502' 
  AND token = 'UMznUerBh0C4y3kpXvsy3sW8X30TEvl1X5OCy+wROUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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