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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ff17fc55ed2e29e78f2c1e9104f3d1839d0d4913ddf8f625e33133076c12ef' 
  AND token = 'NzIHewxvsuvC+hefd6F3o8hTnTmPa66hBWdOv4ZPE6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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