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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bdfd536ceeeb47b0671b5f4521478ef7c42472b9bc9ff86246b799ebeaa9fc0' 
  AND token = '/1eZnAHt2NG51g+q1PZawqUgFtNqpIMmSGz+gd420W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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