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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f79ef1366d1183e8ea44554f3a4c07ceedbe96ef532a274772b1fbc69567865' 
  AND token = '5aGlWbOR1G2Ost4qfAZBZthoyFe0+ghDsHGij2NitWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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