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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f823a3fc56c263d72e90822f70c39b968b2dd4c4c235a3a85daedbc086c75c30' 
  AND token = 'ac4FD48KbsG9gvSWQDyD4mm7b/wwxA6rY/vIrCZETK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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