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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c60c207027b1ed5a594df40faab4877c307a011ed9b47408fc40831cde22238' 
  AND token = 'blM7lTUgs9dNTuyJqtvQwHGV2Tvm/QCRGeg/GEZD2nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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