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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '740e2574aa9bfc44f39048ba8eabaca0ed4ed7ffb59a23f2768bc9745a7e1cad' 
  AND token = 'iycddAKOelaf9AD2zH9mqIurKAUagKWQsPx0VubT/0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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