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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6586f5b3c776e2484c4c9c9f55c6b9381d300cdfb0b4892ec49eddc5f526c87' 
  AND token = 'Mxue7BdCGeigE4NicZsv8FRTM48ynO2EWXnvMVo7Co8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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