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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c57fe118ff43dd725c17108cdb362916b6950407e0a679128161cf89db66395' 
  AND token = '4P02gbktj1aUoeuWX41NkCpcMgc623N0HgTbPc5KrOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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