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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66356db3e37fd2a784b908bdb3291744ca37071e7d1dcf4542305bbd7aab6946' 
  AND token = 'LkyYdo+yO5iwsqGhl7dka6bZRKzwgKyrbVmXkoajA7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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