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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d906d9f1cee1064ac2554f3721aaa5b7c539155c4a91bdcaa637cfd39b05db' 
  AND token = 'rzoI3iBBQ69OMFEF+yFOKNMSSCP+VZAhG/hzJ72JqE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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