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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8f6158cc0f13b8cece3eb7e2afe46f49f87960617301cc0f116bd342e5d128' 
  AND token = 'ikmzPM5Rm4Pxkdo4H2jQSnqJSEjiy/J0r2ARbBwiKF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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