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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd587c97056b6e75b9342ead8c826c5caf26780c51f651b1db37ce74ae194ca58' 
  AND token = 'VTLFiS0vQ9jy9kfQM0K/cqFGFaYYoJdLkvUvNL5f2ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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