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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08fabacae743c9b55c667c460f144e1c28a75019f9d2e3b694142462f4757b4f' 
  AND token = '36DOwM8Djl/hoKpLCg1t7V09WudWLH1gAutuAb3qxrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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