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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b748f687523eeb0dda3801c3d150c9d5b0dcfbf5419febf895aad3c1daa6200' 
  AND token = '1cFX6T39JS7i0jpc3y28/x0GdU2ps+pTvumiEwFrEAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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