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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3f891694d601436938423e02de5edcdf007114305ed674feae270a2e36756d' 
  AND token = 'WXTury9Jg179Jx/ED8q2VloDZYPdIPCF/58Y1J5vbQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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