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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939e21cd85054111b379df5184ab050d1aed1e379cfdb45f05ca9873b8ba794b' 
  AND token = 'vkutDA/cKo+z23+qCePPg2Yyuk9MIhNRdxx/5Hqh4LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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