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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9efb6ee1d2d4ba4c5c433c2f2584cf4eb53880a84cf36b0f300a6b5d219640de' 
  AND token = 'eaFyCubXjwvslwUqF76RTG+YJfVUEYHGd/mf7rAccw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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