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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '337a20582d7948af66639fe40598cf4bf83c9c937004c2a0e91f480ad31afa89' 
  AND token = 'Rtvjj4G7ljgQUzZPwfPZ0JpiokK8mMGs7a84n0dMlDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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