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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69904e4869383a4c0f83790603e22ae838fd49ae07491e61d5e6455be6e132c9' 
  AND token = '2AeQj/0isRthh60K9Hsod7U9JyvbwLkHv/6YMRcXCTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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