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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39499d8b1a42252d2033e83480a207b3524cd06ba6da530bee6382ff05d1efb1' 
  AND token = 'ZqAvAlQY2D8JAXlmWCDJX0p4JEq0pwmHAJZmwcLNlv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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