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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6552e65eb7bad88102a2c5bb1c420e3ee374dc640a3f5ebe7c8ed0e1d19b882a' 
  AND token = 'okSYlszPkM6x2+gOhtJxl/oWpKMVOT9uP3HSkw+BbCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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