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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0adf05d9c32fca1706746e80d1bb94349f7be7e5f0f78462247cb9109ea4c1' 
  AND token = 'zuerXGNuw9rfB4d7E6vdva3zI+p9AaDtwyueMIjJ2u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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