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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82419f01a14c3e0aaa06dc47f65b7dce7938008fd9c209d3bad9138045a71d8' 
  AND token = 'q/6EkFDWmiCHPto29WFmGn6uKt+CjXaohWmlUN3Z2Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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