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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6d33714d48130b621623438d7e166c4c4933112c919846a04512783f734f44' 
  AND token = 'lIJtzokR4Q/VkUgKAEeTS10fTtEA8j1Q7kpEfpQ9HKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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