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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7c57f702ac3cf8dc8d18510b0bb363a3374281e8ea70812bdbf8c0eacfe4f5' 
  AND token = 'vF1HuQNY6S9xIFWZBFHejT9VlavEFvEkfAjGWaZdxBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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