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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f0dcfaf11aaf18151697ca3310ab8de839626c6b02d9a775b53fc53403ea9b' 
  AND token = 'IRBt8WfY0aWr28qPjJ8JSnhyhkAo8QD/YdUWwBxjO6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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