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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48cf26473f32f88ba2db91e8d4db65dbb19c88367f1e6a010d801b4e5b3b3ef2' 
  AND token = 'mKuHESo34t0XG2Q3XmTzF1eyJMPCJwxKcchKBZIlv3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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