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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20bf090c340bc5a4e3ff2d56111419130423af5c7dc485f69bc2f45d6a3b40f1' 
  AND token = 'JDKBjT0SYRjww+nG2D2R8CN+JaX1OVIHUF1cDLmkKw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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