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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234203165a0fddecd999ac99529839c3d8db8ad01d3ec8cc0987258ea8679148' 
  AND token = 'k4zVOORVZmuSGkKlhu8SpWF2fLZeT18GANQJfhBG0Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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