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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beaee0a6779d208df3082131dc90202b5a1e4ac3379a88c0ff7d340fbc81f262' 
  AND token = 'a4gJeZwXl7Xgdc5izv4ps26LTy+gyzs7U0jrzHLQjnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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