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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a7c98f9499b28af0440fc0a220bf62a6b7e98682f4bd6080386ebed2c3447d' 
  AND token = 'nHTyfhSY9cHofE0dcXtvdtkgX+53z/MEz3KNBmEakrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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