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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44bd662183438fc78ab2dfe84244d0c4108c180475e875ebc282a402f876949b' 
  AND token = 'Bak62oOCh9/LW6UlRPZYkmPkF8st5NrxcCWW+yvy/SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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