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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91eb633c254916c61b5f765960edf64037c379b089f34e9794a0ce22d97c6b7' 
  AND token = 'EXva3qMdMM6pW+zqy5Lo0TZYUdPaWh+dRLuXkc/o4yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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